?url_ver=Z39.88-2004&rft_id=10.3390%2Fsu15129846&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Usman+Kankia%2C+M.&rft.aulast=Usman+Kankia&rft.aufirst=M.&rft.date=2023&rft.title=Sustainability+(Switzerland)&rft.atitle=Microstructural+Analysis+and+Compressive+Strength+of+Fly+Ash+and+Petroleum+Sludge+Ash+Geopolymer+Mortar+under+High+Temperatures&rft.issue=12&rft.volume=15&rft.genre=article